CN110518638A - A kind of virtual synchronous generator control strategy that the virtual inertia dynamic of combination is adjusted - Google Patents
A kind of virtual synchronous generator control strategy that the virtual inertia dynamic of combination is adjusted Download PDFInfo
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- CN110518638A CN110518638A CN201910268212.0A CN201910268212A CN110518638A CN 110518638 A CN110518638 A CN 110518638A CN 201910268212 A CN201910268212 A CN 201910268212A CN 110518638 A CN110518638 A CN 110518638A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- Control Of Eletrric Generators (AREA)
Abstract
The invention belongs to micro-capacitance sensor field and technical field of motors, the virtual synchronous generator control strategy adjusted more particularly to a kind of virtual inertia dynamic of combination, it proposes and provides a kind of improved virtual synchronous generator control technology, the present invention combines the improvement virtual synchronous generator control strategy of virtual inertia dynamic adjusting method, overcome the deficiency of traditional virtual synchronous generator control, the oscillation of power occurred in the transient process of micro-capacitance sensor is effectively inhibited, the transient stability of distributed generation unit in exchange micro-capacitance sensor is improved.The present invention can apply to the fields such as more power sources in parallel and new energy micro-capacitance sensor field；The in parallel or stabilization parallel running between multiple power sources is able to satisfy between multiple distributed generation units.
Description
Technical field
The invention belongs to micro-capacitance sensor field and technical field of motors, and in particular to a kind of virtual inertia dynamic of combination is adjusted
Virtual synchronous generator control strategy, system, computer equipment and readable storage medium storing program for executing.
Background technique
Penetration with renewable energy distributed power generation in China's power grid constantly increases, and how to solve distributed power generation
Access and consumption problem are increasingly by the attention of researcher.In order to make full use of new energy distributed power generation and to reduce its right
The impact of bulk power grid, micro-capacitance sensor technology are considered as a kind of effective way, and virtual synchronous generator techniques then can be improved point
Supporting role of the cloth power supply to microgrid and bulk power grid.
Traditional virtual synchronous generator control strategy simulates the dynamic and steady-state characteristic of synchronous generator, because its have compared with
Big inertia and power self-adjusting ability, and it is not necessarily to high-speed communication, and be widely used in micro-capacitance sensor.
However, the virtual inertia in equation of rotor motion is steady state value in the control of traditional virtual synchronous generator.When disturbing
Dynamic when occurring, virtual inertia is too big or the too small dynamic characteristic and steady-state characteristic that can all reduce micro-capacitance sensor.And work as multiple points
When cloth generator unit parallel connection, the mismatch of virtual inertia will bring more serious system oscillation.
Summary of the invention
In view of the above problems, the present invention is intended to provide the virtual synchronous generator control that a kind of virtual inertia dynamic of combination is adjusted
Make strategy, system, computer equipment and readable storage medium storing program for executing.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: it is dynamic to provide a kind of virtual inertia of combination
The virtual synchronous generator control strategy that state is adjusted, includes the following steps:
S1, virtual inertia dynamic are adjusted；The virtual inertia dynamic regulating step becomes according to power variation rate and angular frequency
Rate adjusts in real time and exports virtual inertia signal；
S2, active sagging adjusting；The active sagging regulating step simulation synchronous generator is static and dynamic is active sagging
Characteristic in real time adjusts according to active power and in conjunction with virtual inertia signal and exports angular frequency signal；
S3, idle sagging adjusting；The adjustment of field excitation link of the idle sagging regulating step simulation synchronous generator, according to
Reactive power size adjusts in real time and output voltage signal；
S4, voltage and current double closed-loop；In the voltage and current double closed-loop step, the angular frequency signal and voltage signal warp
Input modulating signal after voltage and current double closed-loop conversion coordinate as SVPWM, the arteries and veins of the SVPWM output control power device
Punching control signal.
As an improvement outer ring is voltage PI control ring in the voltage and current double closed-loop, inner ring is electric current PI control
Ring；The voltage signal inputs SVPWM after the conversion of voltage PI control ring, and the angular frequency signal is converted through electric current PI control ring
After input SVPWM.
Specifically, angular frequency is changed according to the active power being calculated in real time in the active sagging regulating step, and
Phase angle is converted into be transmitted in voltage and current double closed-loop step.
Further, the active sagging regulating step carries out active sagging adjusting according to the following formula:
PS=-△ ω Kd+PR=(ωR-ω)Kd+PR
P in formulaR、PS、KdAnd ωRRespectively given active power, distributed generation unit active power of output, it is active under
Hang down coefficient and given angular frequency.
Further, the virtual inertia dynamic regulating step carries out virtual inertia dynamic adjusting according to the following formula:
J in formulabIndicate biggish rotary inertia, JsIndicate lesser rotary inertia, kcIndicate correction factor, △ PrrIt indicates
Maximum power creep speed in sampling time, C1And C2Respectively indicate rate of power change and rotation speed change rate-valve value, dp/
Dt and dw/dt respectively indicates power variation rate and angular frequency change rate.
As a further improvement, the idle sagging regulating step carries out idle sagging adjusting according to the following formula:
(QR-Q)Ku+UR=U
Q in formulaR、Q、KuAnd URIt is respectively given reactive power, distributed generation unit output reactive power, idle sagging
Coefficient and given voltage.
A kind of virtual synchronous generator control system that the virtual inertia dynamic of combination is adjusted, including virtual inertia dynamic are adjusted
Module, active sagging adjustment module, idle sagging adjusting and voltage and current double closed-loop module；Wherein
Virtual inertia dynamic adjustment module, for being adjusted in real time according to power variation rate and angular frequency change rate and exporting void
Quasi- inertia signal；
Active sagging adjustment module, synchronous generator is static and the active droop characteristic of dynamic for simulating, according to wattful power
Rate simultaneously adjusts in real time in conjunction with virtual inertia signal and exports angular frequency signal；
Idle sagging adjustment module, it is real according to reactive power size for simulating the adjustment of field excitation link of synchronous generator
When adjust and output voltage signal；
Voltage and current double closed-loop module is converted through voltage and current double closed-loop according to the angular frequency signal and voltage signal and is sat
As the input modulating signal of SVPWM, the pulse control signal of the SVPWM output control power device after mark.
It further, include outer ring, inner ring and SVPWM in the voltage and current double closed-loop module, wherein outer ring is voltage
PI control ring, inner ring are electric current PI control ring；The voltage signal inputs SVPWM, the angle after the conversion of voltage PI control ring
Frequency signal inputs SVPWM after the conversion of electric current PI control ring.
A kind of computer equipment, has processor and memory, and the memory is stored with computer program, the calculating
When machine program is executed by the processor, so that the processor executes the step of above-mentioned virtual synchronous generator control strategy
Suddenly.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
When row, so that the processor executes the step of above-mentioned virtual synchronous generator control strategy
The virtual synchronous generator control strategy that a kind of virtual inertia dynamic of combination of the present invention is adjusted, provides a kind of improvement
Virtual synchronous generator control technology, the present invention combine virtual inertia dynamic adjusting method improvement virtual synchronous generator control
System strategy, overcomes the deficiency of traditional virtual synchronous generator control, effectively inhibits in the transient process of micro-capacitance sensor and occur
Oscillation of power, improve exchange micro-capacitance sensor in distributed generation unit transient stability.The present invention can apply to mostly electric
The fields such as source parallel connection and new energy micro-capacitance sensor field；It is able to satisfy between multiple distributed generation units in parallel or between multiple power sources
Stabilization parallel running.
Detailed description of the invention
Fig. 1 is the logical construction for the virtual synchronous generator control strategy that a kind of virtual inertia dynamic of combination of the present invention is adjusted
Schematic diagram；
Fig. 2 is the process signal for the virtual synchronous generator control strategy that a kind of virtual inertia dynamic of combination of the present invention is adjusted
Block diagram；
Fig. 3 is the virtual synchronous generator control system logic theory knot that a kind of virtual inertia dynamic of combination of the present invention is adjusted
Structure schematic block diagram；
Fig. 4 is that the virtual synchronous generator control system modular structure that a kind of virtual inertia dynamic of combination of the present invention is adjusted is shown
Meaning block diagram；
Fig. 5 is Double closed-loop of voltage and current block diagram of the present invention；
Fig. 6 is structural block diagram of the present invention in micro-capacitance sensor；
Fig. 7 is two-shipper and to throw experimental waveform figure when DG1 and DG2 rotary inertia is fixed；
Fig. 8 is DG1 (context of methods) DG2 (fixed rotary inertia) two-shipper and throws experimental waveform figure；
Fig. 9 is DG1 and DG2 using two-shipper when context of methods and throws experimental waveform figure.
Specific embodiment
The virtual synchronous hair that a kind of virtual inertia dynamic of combination provided by the invention is adjusted is illustrated below in conjunction with Fig. 1-9
Motor control strategy.
As shown in Figure 1, 2, the present invention provides a kind of virtual synchronous generator control plan that the virtual inertia dynamic of combination is adjusted
Slightly, include the following steps:
S1, virtual inertia dynamic are adjusted；The virtual inertia dynamic regulating step becomes according to power variation rate and angular frequency
Rate adjusts in real time and exports virtual inertia signal；
S2, active sagging adjusting；The active sagging regulating step simulation synchronous generator is static and dynamic is active sagging
Characteristic in real time adjusts according to active power and in conjunction with virtual inertia signal and exports angular frequency signal；
S3, idle sagging adjusting；The adjustment of field excitation link of the idle sagging regulating step simulation synchronous generator, according to
Reactive power size adjusts in real time and output voltage signal；
S4, voltage and current double closed-loop；In the voltage and current double closed-loop step, the angular frequency signal and voltage signal warp
Input modulating signal after voltage and current double closed-loop conversion coordinate as SVPWM, the arteries and veins of the SVPWM output control power device
Punching control signal.
As an improvement outer ring is voltage PI control ring in the voltage and current double closed-loop, inner ring is electric current PI control
Ring；The voltage signal inputs SVPWM after the conversion of voltage PI control ring, and the angular frequency signal is converted through electric current PI control ring
After input SVPWM.
Specifically, angular frequency is changed according to the active power being calculated in real time in the active sagging regulating step, and
Phase angle is converted into be transmitted in voltage and current double closed-loop step.
Further, the active sagging regulating step carries out active sagging adjusting according to the following formula:
PS=-Δ ω Kd+PR=(ωR-ω)Kd+PR
P in formulaR、PS、KdAnd ωRRespectively given active power, distributed generation unit active power of output, it is active under
Hang down coefficient and given angular frequency.
Further, the virtual inertia dynamic regulating step carries out virtual inertia dynamic adjusting according to the following formula:
J in formulabIndicate biggish rotary inertia, JsIndicate lesser rotary inertia, kcIndicate correction factor, △ PrrIt indicates
Maximum power creep speed in sampling time, C1And C2Respectively indicate rate of power change and rotation speed change rate-valve value, dp/
Dt and dw/dt respectively indicates power variation rate and angular frequency change rate.
As a further improvement, the idle sagging regulating step carries out idle sagging adjusting according to the following formula:
(QR-Q)Ku+UR=U
Q in formulaR、Q、KuAnd URIt is respectively given reactive power, distributed generation unit output reactive power, idle sagging
Coefficient and given voltage.
The improved virtual synchronous generator control strategy of the present invention is tied on the basis of traditional virtual synchronous generator controls
Virtual inertia dynamic adjusting method is closed, the oscillation of power occurred in the effective transient process for inhibiting micro-capacitance sensor；Pass through voltage electricity
Stream double-closed-loop control realizes that electric power output voltage accurately quickly reacts command signal.The present invention finally improves exchange micro-capacitance sensor
The transient stability of middle distributed generation unit.
As in Figure 3-5, the virtual synchronous generator control system that a kind of virtual inertia dynamic of combination is adjusted, including it is virtual
Inertia dynamic adjustment module, active sagging adjustment module, idle sagging adjusting and voltage and current double closed-loop module；Wherein
Virtual inertia dynamic adjustment module, for being adjusted in real time according to power variation rate and angular frequency change rate and exporting void
Quasi- inertia signal；
Active sagging adjustment module, synchronous generator is static and the active droop characteristic of dynamic for simulating, according to wattful power
Rate simultaneously adjusts in real time in conjunction with virtual inertia signal and exports angular frequency signal；
Idle sagging adjustment module, it is real according to reactive power size for simulating the adjustment of field excitation link of synchronous generator
When adjust and output voltage signal；
Voltage and current double closed-loop module is converted through voltage and current double closed-loop according to the angular frequency signal and voltage signal and is sat
As the input modulating signal of SVPWM, the pulse control signal of the SVPWM output control power device after mark.
It further, include outer ring, inner ring and SVPWM in the voltage and current double closed-loop module, wherein outer ring is voltage
PI control ring, inner ring are electric current PI control ring；The voltage signal inputs SVPWM, the angle after the conversion of voltage PI control ring
Frequency signal inputs SVPWM after the conversion of electric current PI control ring.
The coupling for ignoring dq between centers in Double closed-loop of voltage and current, because of dq axial symmetry, so dq axis control parameter is identical.
A kind of computer equipment, has processor and memory, and the memory is stored with computer program, the calculating
When machine program is executed by the processor, so that the processor executes the step of above-mentioned virtual synchronous generator control strategy
Suddenly.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
When row, so that the processor executes the step of above-mentioned virtual synchronous generator control strategy.
It as Figure 6-9, is a kind of improvement virtual synchronous generator of the virtual inertia dynamic adjusting method of combination of the present invention
The specific embodiment of control strategy actual experiment in micro-capacitance sensor.
As shown in fig. 6, micro-capacitance sensor is made of stored energy distribution formula generator unit, load, it is referred to as the power generation of stored energy distribution formula
Cells D G1, stored energy distribution formula generator unit DG2, resistive load；RlmAnd Llm(m=1,2) is line resistance and line electricity respectively
Sense；Uon、ion(n=1,2) and UPCCThe respectively output voltage of distributed generation unit, the output electric current of distributed generation unit
And busbar voltage.DG1 and DG2 can be from absorption active power in AC microgrids or injection active power (P into AC microgridsG1
And PG2).Total active power such as following formula in AC microgrids
∑ P=PG1+PG2-PL-PLoss=0
In formula, PLIt is bearing power, PLossIt is the power loss of route, using virtual synchronous generator control side of the present invention
Method can effectively improve the transient stability of distributed generation unit in exchange micro-capacitance sensor, choose three kinds of moulds of the micro-grid system
Formula is respectively as follows:
(1) mode one: influence of the constant rotation inertia J to distributed generation unit transient stability
DG1 and DG2 is all made of fixed rotary inertia, rotary inertia J1=J2=8, experimental result is as shown in fig. 7, work as DG2
After being incorporated to, very big oscillation of power is produced, peak swing power is about 5kW, from current waveform it can be seen that apparent
Power swing, oscillation of power time continue for 1s or so, and finally in 1500ms or so, system is settled out, and realize frequency
Divide equally.
(2) mode two: verifying of the rotary inertia dynamic regulating method in the generator unit parallel connection of same distribution formula is improved
DG1 uses rotary inertia dynamic regulation strategy (J proposed in this paperb=8, JS=1, correction term parameter kc=0:
001), DG2 is using fixed rotary inertia strategy J2=8, experimental results are shown in figure 8, and the Comparative result with mode one, DG1 adds
After entering rotary inertia, good inhibition left and right is played to oscillation of power, power swing is reduced to 2000W or so, the oscillation of power
It is reduced to 2.5kW, the duration of transient process is reduced to 600ms or so.
(3) mode three: verifying of the rotary inertia dynamic regulating method in different VSG parallel connections is improved
VSG1 and VSG2 is all made of rotary inertia dynamic regulation strategy proposed in this paper, and control parameter is (Jb=8, JS=1,
Correction term parameter kc=0:001), experimental result is as shown in figure 9, instantaneous tie power fluctuation peak is reduced to 1.8kW or so, transient state
Process time is reduced to 400ms or so.
When using virtual synchronous generator control method of the present invention, proposes the validity of strategy herein for verifying, take
The step of are as follows:
Step 1: the experiment for establishing two stylobates in compositions such as the distributed generation units and load for improving VSG control strategy is flat
Platform.
Step 2:DG1 band carries 5kW operation, DG2 idle running.
Step 3: in 400ms, putting into DG2 under three kinds of different conditions respectively and realize double parallel.
Step 4: experimental result is compared.
The virtual synchronous generator control strategy that a kind of virtual inertia dynamic of combination of the present invention is adjusted, it is synchronous in traditional virtual
In generator control, the virtual inertia in equation of rotor motion is steady state value, when multiple distributed generation unit parallel connections, virtually
The mismatch of inertia will bring more serious system oscillation.The present invention is on the basis of traditional virtual synchronous generator control strategy
It is upper to use virtual inertia dynamic adjusting method, propose a kind of improvement virtual synchronous hair of virtual inertia dynamic adjusting method of combination
Motor control strategy overcomes the deficiency of traditional virtual synchronous generator control, effectively in the transient process of inhibition micro-capacitance sensor
The oscillation of power of appearance.The present invention finally improves the transient stability of distributed generation unit in exchange micro-capacitance sensor.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of virtual synchronous generator control strategy that the virtual inertia dynamic of combination is adjusted, which is characterized in that including walking as follows
It is rapid:
S1, virtual inertia dynamic are adjusted；The virtual inertia dynamic regulating step is according to power variation rate and angular frequency change rate
It adjusts in real time and exports virtual inertia signal；
S2, active sagging adjusting；The active sagging regulating step simulation synchronous generator is static and the active droop characteristic of dynamic,
It in real time adjusts according to active power and in conjunction with virtual inertia signal and exports angular frequency signal；
S3, idle sagging adjusting；The adjustment of field excitation link of the idle sagging regulating step simulation synchronous generator, according to idle
Watt level adjusts in real time and output voltage signal；
S4, voltage and current double closed-loop；In the voltage and current double closed-loop step, the angular frequency signal and voltage signal are through voltage
Input modulating signal after current double closed-loop conversion coordinate as SVPWM, the pulse control of the SVPWM output control power device
Signal processed.
2. virtual synchronous generator control strategy according to claim 1, which is characterized in that the voltage and current double closed-loop
Middle outer ring is voltage PI control ring, and inner ring is electric current PI control ring；The voltage signal inputs after the conversion of voltage PI control ring
SVPWM, the angular frequency signal input SVPWM after the conversion of electric current PI control ring.
3. virtual synchronous generator control strategy according to claim 1, which is characterized in that the active sagging adjusting step
In rapid, angular frequency is changed according to the active power being calculated in real time, and be converted into phase angle and be transmitted to voltage and current double closed-loop
In step.
4. virtual synchronous generator control strategy according to claim 3, which is characterized in that the active sagging adjusting step
Suddenly active sagging adjusting is carried out according to the following formula:
PS=-△ ω Kd+PR=(ωR-ω)Kd+PR
P in formulaR、PS、KdAnd ωRRespectively given active power, distributed generation unit active power of output, active sagging coefficient
With given angular frequency.
5. virtual synchronous generator control strategy according to claim 3, which is characterized in that the virtual inertia dynamic tune
Section step carries out virtual inertia dynamic adjusting according to the following formula:
J in formulabIndicate biggish rotary inertia, JsIndicate lesser rotary inertia, kcIndicate correction factor, △ PrrIndicate sampling
Maximum power creep speed in time, C1And C2Respectively indicate rate of power change and rotation speed change rate-valve value, dP/dt and
Dw/dt respectively indicates power variation rate and angular frequency change rate.
6. virtual synchronous generator control strategy according to claim 1, which is characterized in that the idle sagging adjusting step
Suddenly idle sagging adjusting is carried out according to the following formula:
(QR-Q)Ku+UR=U
Q in formulaR、Q、KuAnd URRespectively given reactive power, distributed generation unit output reactive power, idle sagging coefficient
And given voltage.
7. a kind of virtual synchronous generator control system that the virtual inertia dynamic of combination is adjusted, which is characterized in that including being virtually used to
Measure dynamic regulation module, active sagging adjustment module, idle sagging adjusting and voltage and current double closed-loop module；Wherein
Virtual inertia dynamic adjustment module, it is virtual used for being adjusted and being exported in real time according to power variation rate and angular frequency change rate
Measure signal；
Active sagging adjustment module, synchronous generator is static and the active droop characteristic of dynamic for simulating, simultaneously according to active power
It is adjusted in real time in conjunction with virtual inertia signal and exports angular frequency signal；
Idle sagging adjustment module is adjusted for simulating the adjustment of field excitation link of synchronous generator according to reactive power size in real time
Save simultaneously output voltage signal；
Voltage and current double closed-loop module, according to the angular frequency signal and voltage signal after voltage and current double closed-loop converts coordinate
As the input modulating signal of SVPWM, the pulse control signal of the SVPWM output control power device.
8. virtual synchronous generator control system according to claim 7, it is characterised in that the voltage and current double closed-loop
It include outer ring, inner ring and SVPWM in module, wherein outer ring is voltage PI control ring, and inner ring is electric current PI control ring；The voltage
Signal inputs SVPWM after the conversion of voltage PI control ring, and the angular frequency signal inputs after the conversion of electric current PI control ring
SVPWM。
9. a kind of computer equipment, which is characterized in that there is processor and memory, the memory is stored with computer journey
Sequence, when the computer program is executed by the processor, so that the processor is executed such as any one of claim 1~6 institute
The step for the virtual synchronous generator control strategy stated.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
When being executed by processor, so that the processor executes virtual synchronous generator control as described in any one of claims 1 to 6
The step of strategy.
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| CN112838579A (en) * | 2021-01-25 | 2021-05-25 | 湖南工学院 | Analog synchronous generator virtual synchronous controller for improving system stability and robustness |
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